Stack-based Buffer Overflow in Tenda CX12L Wi-Fi Configuration Endpoint
CVE-2026-11503

8.7HIGH

Key Information:

Vendor

Tenda
Status
Cx12l
Vendor
CVE Published:
8 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-11503?

A vulnerability has been identified in the Tenda CX12L Wi-Fi router that allows for a stack-based buffer overflow through the 'form_fast_setting_wifi_set' function. The issue arises when manipulating the 'ssid' argument within the '/goform/fast_setting_wifi_set' file of the Wi-Fi Configuration Endpoint. This vulnerability can be exploited remotely, potentially allowing attackers to execute arbitrary code on the affected device. Given the public disclosure of this exploit, it poses a significant risk to users if not addressed.

Affected Version(s)

CX12L 16.03.53.12

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-11503 - Proof of Concept

References

https://vuldb.com/vuln/369123
vdb-entrytechnical-description
https://vuldb.com/vuln/369123/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-11503
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

moist (VulDB User)
.